The CDL Prep app that knows when you're ready to pass
Free CDL practice tests that mirror the real exam: same question counts and time limits, every answer explained, and an IQ Readiness Score that tells you when to book your test.
2,800+ CDL questionsAll 50 statesFree to start
Choose a CDL exam
Real CDL applicants take a separate written test per section. Each simulation uses the actual question count and time limit.
Free CDL practice tests for every section
Every set is free, drawn from FMCSA-aligned questions, with every answer explained. Pick a section to practice on the web, or get the app to study on your phone.
General Knowledge
50 questions · 90 min · 80% to pass
Every CDL starts here. Vehicle control, safe driving, and cargo basics that every commercial driver must pass, regardless of class.
Air Brakes
25 questions · 30 min · 80% to pass
Removes the air brake restriction from your CDL. Covers system components, inspection steps, and braking with air-equipped vehicles.
Combination
20 questions · 25 min · 80% to pass
Required for Class A. Coupling and uncoupling, trailer handling, and preventing rollovers and jackknifes in tractor-trailer rigs.
Pre-Trip Inspection
Skills test · Part 1
The first part of the skills test and the most failed. Learn the full inspection sequence before you start the engine on test day.
HazMat(H)
30 questions · 40 min · 80% to pass
Transport hazardous materials. Placarding, loading rules, and emergency response. Requires a TSA background check in every state.
Tanker(N)
20 questions · 25 min · 80% to pass
Drive tank vehicles carrying liquids or gases. Surge control, baffled vs. unbaffled tanks, and the handling risks of liquid loads.
Passenger(P)
20 questions · 25 min · 80% to pass
Carry 16 or more passengers. Loading, emergency exits, railroad crossings, and the rules that apply to buses of every kind.
School Bus(S)
20 questions · 25 min · 80% to pass
The most regulated endorsement. Student loading zones, danger zones around the bus, and emergency procedures. Requires P first.
Doubles/Triples(T)
20 questions · 25 min · 80% to pass
Pull double or triple trailers with a Class A. Coupling sequence, crack-the-whip effect, and multi-trailer stability.
What you get with DMV IQ
A CDL prep app built to get you licensed faster, not to pad your study time.
IQ Readiness Score™
One 0 to 100 score per section, built from how well you know the material and how well it sticks. When it hits the ready zone, book your test.
Learns your weak spots
Missed questions come back right before you would forget them, and your mastery in every CDL section stays in view.
Pro tracks your mastery in every CDL section, so you always know exactly what to drill next.
How CDL Prep works
Pick your section
Choose General Knowledge or the endorsement you need. The app pulls FMCSA-aligned questions for your state.
Practice like the real test
Run timed simulations at the real question count, review every explanation, and drill the topics you miss.
Watch your readiness climb
Your IQ Readiness Score rises as you master each topic. When it hits the ready zone, book your test.
CDL practice tests by state
Knowledge tests vary by state. DMV IQ matches questions and formats to your state's CDL manual.
Common questions about CDL prep
Ready when you are
Get the app and study anywhere, or start a free practice test in your browser.